CN109622606A - A kind of method of phytoremediation chromium-polluted soil - Google Patents
A kind of method of phytoremediation chromium-polluted soil Download PDFInfo
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- CN109622606A CN109622606A CN201811582928.XA CN201811582928A CN109622606A CN 109622606 A CN109622606 A CN 109622606A CN 201811582928 A CN201811582928 A CN 201811582928A CN 109622606 A CN109622606 A CN 109622606A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
- B09C—RECLAMATION OF CONTAMINATED SOIL
- B09C1/00—Reclamation of contaminated soil
- B09C1/10—Reclamation of contaminated soil microbiologically, biologically or by using enzymes
- B09C1/105—Reclamation of contaminated soil microbiologically, biologically or by using enzymes using fungi or plants
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
- B09C—RECLAMATION OF CONTAMINATED SOIL
- B09C2101/00—In situ
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Abstract
The present invention provides a kind of methods of phytoremediation chromium-polluted soil.This method comprises the following steps: young grass tongue fur is transplanted to the soil of pollution of chromium.Wherein, the concentration of chromium (potassium bichromate) is lower than 300mg/kg in the soil.The present invention carries out the reparation of chromium-polluted soil using young grass tongue fur, young grass tongue fur rhizome is flourishing, tillering ability is strong, fast, drought-enduring, resistance to soil depletion is interrogated in growth, and its it is resistance to gather in repeatedly, need to only plant once can constantly be grown rhizome by underground part and breeds many new plants；Young grass tongue fur has patience to chromium-polluted soil, the chromium in soil can be transferred to overground part by root system absorption, the purpose of heavy metal-polluted soil chromium can be removed by harvesting overground part.
Description
Technical field
Technical field of soil remediation of the present invention, more particularly, to a kind of method of phytoremediation chromium-polluted soil.
Background technique
Chromium in nature exists in the form of trivalent chromium and Cr VI, and trivalent chromium can switch to sexavalence again under oxidative conditions
Chromium, and Cr VI toxicity is maximum, most persistently, is easy to be absorbed by plants, and chromium is in China's leather processing, chemical light industry, metal smelting
The fields such as refining, machining, plastic processing are widely applied, since its unreasonable used and being discharged and agriculture chemical
Unreasonable use causes China's soil to face the pollution of chromium of large area, and chromium can enter human body by food chain, endanger people
Body health, therefore, effectively it is safe especially heavy to China's grain and food is ensured to avoid pollution further expansion for reparation chromium-polluted soil
It wants.
Remediating heavy metal chromium-polluted soil method includes: reduction precipitation method at present, also using iron and ferrous salt, sulfide etc.
Hexavalent chrome reduction is trivalent chromium by former agent, to precipitate；Chemical cleaning method cleans soil using chelating agent such as EDTA, leads to
The chromium in chelating soil is crossed, reparation purpose is reached；Phytoremediation is led to using the chromium in the plant absorption of resistance to chromium or Enriching soil
It crosses harvesting plant and achievees the purpose that soil Cr is removed, first two method cost is big, technology is complicated, and faces secondary pollution problem,
And plant restoration method is simple, applied widely, low in cost, effect is more direct, but it is possible to effective enriching heavy metal chromium
Plant is seldom.
Summary of the invention
The purpose of the present invention is to provide a kind of methods of phytoremediation chromium-polluted soil.This method comprises the following steps:
Young grass tongue fur is transplanted to the soil of pollution of chromium.
Young grass tongue fur (carex duriuscula) be herbaceos perennial, be distributed widely in Heilungkiang, Jilin, Liaoning,
The Inner Mongol, Hebei, Shanxi, Shaanxi, Gansu, Ningxia and Xinjiang etc. save (area), and rhizome is flourishing, tillering ability is strong, speed is interrogated in growth, resistance to
Non-irrigated, resistance to soil depletion, and its it is resistance to gather in repeatedly, applicants have found that, young grass tongue fur to chromium-polluted soil have patience, because
This, plants young grass tongue fur, by gathering in the heavy metal chromium that can be removed in soil repeatedly, to control soil on the soil of pollution of chromium
Middle chromium content is in level of security.
After young grass tongue fur transfer, plant can continued growth, while underground part grows new rhizome, after rhizome grows soil, after
Supervention educates and grows up to new young grass tongue fur plant, therefore, in the present invention, need to only plant once, young grass tongue fur can pass through underground part
Constantly grows rhizome and breed many new plants.
Method of the invention not will form secondary pollution, efficient and at low cost.
In a preferred embodiment of the invention, for the ease of surviving in the soil after pollution of chromium, the young grass tongue fur
For the young grass tongue fur of 5~6cm long.Wherein, the length of young grass tongue fur of the invention is less than 15cm.
In a preferred embodiment of the invention, the implantation methods of the young grass tongue fur include the following steps:
It applies 30~40kg calcium magnesium phosphate per acre on the soil after sterilization, sows 0.4~1.0kg young grass tongue fur kind per acre
Son after planting covers 1~2cm thickness soil in upper soll layer, obtains young grass tongue fur.
Wherein, the implantation methods of young grass tongue fur preferably include following steps:
At the beginning of 4 months, 30~40kg calcium magnesium phosphate is applied per acre on the soil after sterilization, sow 0.5~0.6kg cuns per acre
Careless tongue fur seed after planting covers 1~2cm thickness soil in upper soll layer, obtains young grass tongue fur.
Wherein, method for disinfection commonly used in the art can be used, it is preferable to use 50% carbendazim, 800 times of solution sprays in sterilization
Apply soil.
It is described in order to guarantee to transplant effect, tiller space and repairing effect in a preferred embodiment of the invention
The spacing in the rows of transplanting is 3~10cm, preferably 5~7cm.
It further include following steps in a preferred embodiment of the invention: to the chromium-polluted soil for having transplanted young grass tongue fur
0.045~0.06kg of upper every square metre of application contains the compound fertilizer of calcium and magnesium phosphorus.
In a preferred embodiment of the invention, if chromium exists in the form of potassium bichromate, potassium bichromate is dense in soil
Degree is less than 300mg/kg, is further preferably not higher than 200mg/kg, can be preferably not higher than 100mg/kg.After transplanting, young grass
Tongue fur shows stronger chromium absorbability, also has preferable biomass, can be preferably 100mg/kg~200mg/kg.
In a preferred embodiment of the invention, the method for above-mentioned phytoremediation chromium-polluted soil includes the following steps:
It applies 30~40kg calcium magnesium phosphate per acre on the soil after sterilization, sows 0.4~1.0kg young grass tongue fur kind per acre
Son after planting covers 1~2cm thickness soil in upper soll layer, long to 5~6cm to young grass tongue fur, is transplanted to pollution of chromium
On soil, the spacing in the rows of transplanting is 3~10cm, every square metre of application 0.045~0.06kg calcium magnesium phosphate.Wherein, chromium (weight in soil
Potassium chromate) concentration be lower than 300mg/kg.
Wherein, the spacing in the rows of transplanting is preferably 5~7cm.
In the present invention, it is preferred to when young grass tongue fur plant length can start to gather in 15cm.Since young grass tongue fur is perennial grass
This plant, therefore subterranean root retains, and continues to cultivate repeatedly, gather in, and carries out ashing processing, recycling weight to harvested overground part
Crome metal.
The present invention innovatively uses young grass tongue fur to carry out the reparation of chromium-polluted soil, and young grass tongue fur rhizome is flourishing, tillering ability is strong, raw
It is long to interrogate fast, drought-enduring, resistance to soil depletion, and its it is resistance to gather in repeatedly, need to only plant once, young grass tongue fur can be continuous by underground part
Grow rhizome and breed many new plants, can gather in repeatedly every year repeatedly, the heavy metal in soil is effectively shifted, compared with
Other plants are more economized on resources using young grass tongue fur, are convenient and efficient.Compared to other plants, method of the invention can be more
Heavy metal chromium in soil content is controlled in level of security fastly.The resistance to heavy metal chromium of young grass tongue fur can pass through the chromium in soil
Root system absorption is transferred to overground part, and the purpose of heavy metal-polluted soil chromium can be removed by harvesting overground part, realizes maximum limit in soil
It spends chromium and removes purpose, to control in soil chromium content in level of security.Method provided by the invention is not necessarily to special management, can be very
It quite grows, cultivation is at low cost, and chromium transfer efficiency is high, especially enriches soils of north China heavy metal chromium pollution and removes plant new product
Kind.
Detailed description of the invention
Fig. 1 is various concentration K in experimental example2Cr2O7Young grass tongue fur overground part and underground part biomass after contaminated soil processing
Figure；
Fig. 2 is various concentration K in experimental example2Cr2O7The content of young grass tongue fur overground part and underground part chromium after contaminated soil processing
Figure.
Specific embodiment
With reference to embodiment, the embodiment of the present invention is furthur described in detail.Following embodiment is used for
Illustrate the present invention, but is not intended to limit the scope of the invention.
Unless otherwise specified, the conventional means that technological means used is well known to those skilled in the art in embodiment, institute
It is commercial goods with raw material.
Embodiment 1
A kind of method for present embodiments providing phytoremediation chromium-polluted soil, includes the following steps:
1) seedling culture of young grass tongue fur
Young grass tongue fur is planted at the beginning of 4 months, mu sowing quantity 0.5kg, sprays soil using 50% carbendazim, 800 times of solution before sowing
Disinfection and sterilization applies 30 kilograms of calcium and magnesium phosphorus base fertilizer per acre, and after planting upper soll layer covers 1cm thickness soil, controls soil moisture,
Promote seed to sprout, can transplant to young grass tongue fur length to 5cm to heavy metal chromium pollution soil.
2) chromium-polluted soil prepares:
Basic soil is derived from Heilongjiang Province's Suihua City, heavy metal free chromium-polluted soil, and 105 DEG C of soil dry 8 hours, takes
10kg is packed into square plastic Culture basin, having a size of 40cm*40cm, then sprays K2Cr2O7Solution, manual manufacture K2Cr2O7It is dirty
Soil 100mg/kg is contaminated, 3 repetitions is done and tests.
3) contain K above-mentioned2Cr2O7On contaminated soil, young grass tongue fur seedling, 0.06 kilogram of calcium and magnesium of every square metre of application are planted
Phosphorus base fertilizer plants spacing in the rows 5cm, when young grass tongue fur plant it is long to 15cm when, gather in the overground part of young grass tongue fur.
Embodiment 2~3
Step and all the same in embodiment 1, the different concentration difference for being chromium-polluted soil in step 2 in embodiment 2 and 3
For 200mg/kg, 300mg/kg.
Experimental example
Reference examples
In reference examples step with it is all the same in embodiment 1, difference be chromium-polluted soil in step 2 concentration be 0mg/
kg。
Young grass tongue fur biomass and chromium content detection
Detection method: when young grass tongue fur it is long to 15cm when, gather in overground part blade, carefully dig up roots, rinsed out with tap water
Culture substrate, then rinsed 3 times with deionized water, with blotting paper suck dry moisture, weighs and record data.Material is put into baking oven
110 DEG C of water-removing 10min, temperature is adjusted to 80 DEG C of continuation, and drying to constant weight, weighs and records data.Take a little root and overground part leaf
Piece is cut with scissors, uses mortar grinder respectively, weighs 0.1g powder, and digestion solution 10ml (HNO is added3:HClO4=4:1), it is static
30min is placed, 180 DEG C of resolution 1h in microwave dissolver is transferred to, digestion solution is transferred in volumetric flask and is settled to 25ml, is used
Plasma spectroscopy instrument ICP-MS is that 214.438nm wave band measures root and overground part blade Cr content, each processing in wavelength
It is repeated 3 times, is averaged.
Biomass testing result:
The experimental results showed that as shown in Figure 1, the 100mg/kg K of low concentration2Cr2O7In contaminated soil, with control material
0mg/kg K2Cr2O7Compared to (overground part dry weight is 0.20mg, underground part 0.13mg), young grass tongue fur overground part and underground part biology
Amount reaches highest, and overground part dry weight is 0.44mg, underground part 0.26mg；As K in soil2Cr2O7Concentration reaches 200mg/kg, when,
Overground part dry weight is 0.33, underground part 0.22mg, also compared with control material height；And K in soil2Cr2O7Content reaches 200mg/kg
When, overground part dry weight is 0.16mg, and underground part dry weight is only 0.10mg, lower than control material, it can be seen that, young grass tongue fur exists
100mg/kg and 200mg/kg K2Cr2O7In contaminated soil, underground part and overground part are able to maintain higher biomass, therefore
100mg/kg and 200mg/kg K2Cr2O7Contaminated soil is suitble to young grass tongue fur normal growth, and can grow it is more preferable, and in the soil
K2Cr2O7When content reaches 300mg/kg, the growth of young grass tongue fur is obviously suppressed, and overground part and underground part biomass is caused to drop
It is low.
Chromium content testing result
As shown in Fig. 2, the 100mg/kg K of low concentration2Cr2O7In contaminated soil, overground part chromium content 108.24mg/kg,
Underground part chromium content is 87.38mg/kg；As the K in soil2Cr2O7When content is 200mg/kg, overground part chromium accumulation is
86.61mg/kg, underground part chromium content are 76.79mg/kg；As the K in soil2Cr2O7Content is in 300mg/kg, young grass tongue fur
The chromium content on top is 72.12mg/kg, and underground part chromium content is 61.76mg/kg, has shown apparent enriching quantity decline.
In various concentration K2Cr2O7In the soil of processing, young grass tongue fur is demonstrated by different biomass accumulation feature and enrichment
Chromium ability: young grass tongue fur is being lower than 200mg/kg K2Cr2O7Higher biomass can be shown in contaminated soil and stronger chromium is rich
Collection ability can handle recyclable chromium by subsequent ashing with the chromium in Enriching soil by constantly gathering in overground part, thus
Achieve the purpose that soil remediation.And as the K in soil2Cr2O7Concentration reaches 300mg/kg, and young grass tongue fur, which obviously grows, to be suppressed,
Biomass reduces.
Finally, method of the invention is only preferable embodiment, it is not intended to limit the scope of the present invention.It is all
Within the spirit and principles in the present invention, any modification, equivalent replacement, improvement and so on should be included in protection of the invention
Within the scope of.
Claims (9)
1. a kind of method of phytoremediation chromium-polluted soil, which comprises the steps of:
Young grass tongue fur is transplanted to the soil of pollution of chromium.
2. the method according to claim 1, wherein chromium in terms of in the form of potassium bichromate, weighs chromium in the soil
The concentration of sour potassium is lower than 300mg/kg.
3. method according to claim 1 or 2, which is characterized in that chromium is in terms of in the form of potassium bichromate, weight in the soil
The concentration of potassium chromate is not higher than 200mg/kg.
4. according to the method in any one of claims 1 to 3, which is characterized in that chromium is described in terms of in the form of potassium bichromate
The concentration of potassium bichromate is 100~200mg/kg in soil.
5. method according to claim 1 to 4, which is characterized in that the spacing in the rows of the transplanting is 3~10cm.
6. the method according to any one of claims 1 to 5, which is characterized in that the spacing in the rows of the transplanting is 5~7cm.
7. method according to any one of claim 1 to 6, which is characterized in that cun that the young grass tongue fur is 5~6cm long
Careless tongue fur.
8. method according to any one of claim 1 to 7, which is characterized in that described method includes following steps:
It applies 30~40kg calcium magnesium phosphate per acre on the soil after sterilization, sows 0.4~1.0kg young grass tongue fur seed per acre, broadcast
1~2cm thickness soil is covered in upper soll layer after kind, it is long to 5~6cm to young grass tongue fur, it is transplanted to the soil of pollution of chromium
On, the spacing in the rows of transplanting is 3~10cm；Chromium is in terms of in the form of potassium bichromate, and the concentration of potassium bichromate is lower than in the soil
300mg/kg。
9. method according to any one of claim 1 to 8, which is characterized in that further include, when the young grass tongue fur plant is long
When to 15cm, the overground part of young grass tongue fur can be gathered in.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115193908A (en) * | 2022-07-28 | 2022-10-18 | 西南科技大学 | Chromium-contaminated soil phytoremediation method based on root sequence method |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1568668A (en) * | 2003-07-16 | 2005-01-26 | 中国科学院沈阳应用生态研究所 | Screening method for heavy metal enriched / accumulated plant |
| CN103011411A (en) * | 2012-11-23 | 2013-04-03 | 玉溪师范学院 | Method for repairing hexavalent chromium-containing wastewater through water planting cyperus alternifoliu |
| CN104607444A (en) * | 2014-12-04 | 2015-05-13 | 河南金谷实业发展有限公司 | Method for restoring Cr-polluted soil by utilizing cyperus rotundus L. |
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2018
- 2018-12-24 CN CN201811582928.XA patent/CN109622606B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1568668A (en) * | 2003-07-16 | 2005-01-26 | 中国科学院沈阳应用生态研究所 | Screening method for heavy metal enriched / accumulated plant |
| CN103011411A (en) * | 2012-11-23 | 2013-04-03 | 玉溪师范学院 | Method for repairing hexavalent chromium-containing wastewater through water planting cyperus alternifoliu |
| CN104607444A (en) * | 2014-12-04 | 2015-05-13 | 河南金谷实业发展有限公司 | Method for restoring Cr-polluted soil by utilizing cyperus rotundus L. |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115193908A (en) * | 2022-07-28 | 2022-10-18 | 西南科技大学 | Chromium-contaminated soil phytoremediation method based on root sequence method |
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